CVE-2020-15247
mediumpriority · track · 21OT risk · elevatedEPSS 0.003 · 22 %ileEUUSEPSS · scored 2026-10-27
October is a free, open-source, self-hosted CMS platform based on the Laravel PHP Framework. In October CMS from version 1.0.319 and before version 1.0.469, an authenticated backend user with the cms.manage_pages, cms.manage_layouts, or cms.manage_partials permissions who would normally not be permitted to provide PHP code to be executed by the CMS due to cms.enableSafeMode being enabled is able to write specific Twig code to escape the Twig sandbox and execute arbitrary PHP. This is not a problem for anyone that trusts their users with those permissions to normally write & manage PHP within the CMS by not having cms.enableSafeMode enabled, but would be a problem for anyone relying on cms.enableSafeMode to ensure that users with those permissions in production do not have access to write & execute arbitrary PHP. Issue has been patched in Build 469 (v1.0.469) and v1.1.0.
cvss
Technical severity, 0–10. One row per scoring source.
base score 0–10 · higher = more severe · hover a vector to decode
weaknesses
The CWE weakness classes this flaw belongs to.
affected products (3)
Products and version ranges known to be affected.
advisories (1)
Vendor and ecosystem advisories describing this.
- GHSA-94vp-rmqv-5875Twig Sandbox Escape by authenticated users with access to editing CMS templates when safemode is enabled.2020-11-23ghsa · osvUS
### Impact An authenticated backend user with the `cms.manage_pages`, `cms.manage_layouts`, or `cms.manage_partials` permissions who would **normally** not be permitted to provide PHP code to be executed by the CMS due to `cms.enableSafeMode` being enabled is able to write specific Twig code to escape the Twig sandbox and execute arbitrary PHP. This is not a problem for anyone that trusts their users with those permissions to normally write & manage PHP within the CMS by not having `cms.enableSafeMode` enabled, but would be a problem for anyone relying on `cms.enableSafeMode` to ensure that users with those permissions in production do not have access to write & execute arbitrary PHP. ### Patches Issue has been patched in Build 469 (v1.0.469) and v1.1.0. ### Workarounds Apply https://github.com/octobercms/october/compare/106daa2930de4cebb18732732d47d4056f01dd5b...7cb148c1677373ac30ccfd3069d18098e403e1ca to your installation manually if unable to upgrade to Build 469. ### References Reported by [ka1n4t](https://github.com/ka1n4t) ### For more information If you have any questions or comments about this advisory: * Email us at [hello@octobercms.com](mailto:hello@octobercms.com) ### Threat assessment: <img width="1108" alt="Screen Shot 2020-10-10 at 1 21 13 PM" src="https://user-images.githubusercontent.com/7253840/95663316-7de28b80-0afb-11eb-999d-a6526cf78709.png">
also known as (3)
Other names and identifiers for this entity.
sources
Which sources assert this record, and when.
references (7)
External citations — patches, advisories, analysis.
- https://github.com/octobercms/october/commit/4c650bb775ab849e48202a4923bac93bd74f9982cnnvd
- https://github.com/octobercms/october/security/advisories/GHSA-94vp-rmqv-5875cnnvd
- https://nvd.nist.gov/vuln/detail/CVE-2020-15247cnnvd
- https://github.com/octobercms/october/commit/4c650bb775ab849e48202a4923bac93bd74f9982enisa_euvd
- https://github.com/octobercms/october/security/advisories/GHSA-94vp-rmqv-5875enisa_euvd
- https://github.com/octobercms/october/commit/4c650bb775ab849e48202a4923bac93bd74f9982PatchThird Party Advisorynvd
- https://github.com/octobercms/october/security/advisories/GHSA-94vp-rmqv-5875Third Party Advisorynvd
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